/* xdirname.c: return the directory part of a path.

    Copyright 2005 Olaf Weber.
    Copyright 1999 Karl Berry.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

/* Return directory for NAME.  This is "." if NAME contains no directory
   separators (should never happen for selfdir), else whatever precedes
   the final directory separator, but with multiple separators stripped.
   For example, `xdirname ("/foo//bar.baz")' returns "/foo".  Always
   return a new string.  */

#include <kpathsea/config.h>
#include <kpathsea/c-pathch.h>

string
xdirname P1C(const_string, name)
{
    string ret;
    unsigned limit = 0, loc;
    
    /* Ignore a NULL name. */
    if (!name)
        return NULL;
    
    if (NAME_BEGINS_WITH_DEVICE(name)) {
        limit = 2;
#if defined(WIN32) || defined(__CYGWIN__)
    } else if (IS_UNC_NAME(name)) {
        for (limit = 2; name[limit] && !IS_DIR_SEP(name[limit]); limit++)
            ;
        if (name[limit]) {
            for (limit++ ; name[limit] && !IS_DIR_SEP(name[limit]); limit++)
                ;
            limit--;
        } else {
            /* malformed UNC name, backup */
            limit = 2;
        }
#endif
    }
    
    for (loc = strlen (name); loc > limit && !IS_DIR_SEP (name[loc-1]); loc--)
        ;
    
    if (loc == limit && limit > 0) {
        if (limit == 2) {
            ret = (string)xmalloc(limit + 2);
            ret[0] = name[0];
            ret[1] = name[1];
            ret[2] = '.';
            ret[3] = '\0';
        } else {
            ret = (string)xmalloc(limit + 2);
            strcpy(ret, name);
        }
    } else {
        /* If have ///a, must return /, so don't strip off everything.  */
        while (loc > limit+1 && IS_DIR_SEP (name[loc-1])) {
            loc--;
        }
        ret = (string)xmalloc(loc+1);
        strncpy(ret, name, loc);
        ret[loc] = '\0';
    }
    
    return ret;
}

#ifdef TEST

char *tab[] = {
    "\\\\neuromancer\\fptex\\bin\\win32\\kpsewhich.exe",
    "\\\\neuromancer\\fptex\\win32\\kpsewhich.exe",
    "\\\\neuromancer\\fptex\\kpsewhich.exe",
    "\\\\neuromancer\\kpsewhich.exe",
    "p:\\bin\\win32\\kpsewhich.exe",
    "p:\\win32\\kpsewhich.exe",
    "p:\\kpsewhich.exe",
    "p:bin\\win32\\kpsewhich.exe",
    "p:win32\\kpsewhich.exe",
    "p:kpsewhich.exe",
    "p:///kpsewhich.exe",
    "/usr/bin/win32/kpsewhich.exe",
    "/usr/bin/kpsewhich.exe",
    "/usr/kpsewhich.exe",
    "///usr/kpsewhich.exe",
    "///kpsewhich.exe",
    NULL 
};

int main()
{
    char **p;
    for (p = tab; *p; p++)
        printf("name %s, dirname %s\n", *p, xdirname(*p));
    return 0;
}
#endif /* TEST */


/*
Local variables:
standalone-compile-command: "gcc -g -I. -I.. -DTEST variable.c kpathsea.a"
End:
*/

